package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;


/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        // 2.生成验证码
        String code= RandomUtil.randomNumbers(6);
        // 3.保存验证码到redis
        //session.setAttribute("code", code);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY +phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 4.发送验证码
        log.info("发送验证码成功，验证码为：{}", code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        // 2.从redis中获取验证码并校验
        //Object cacheCode = session.getAttribute("code");
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cacheCode==null || !cacheCode.equals(code)){
            return Result.fail("验证码错误");
        }
        // 3.查询用户是否存在
        User user = query().eq("phone", phone).one();
        if(user==null){
            //不存在，则创建
            user =  createUserWithPhone(phone);
        }
        // 5.保存用户信息到redis
       // session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //5.1随机生成token作为登录凭证
        String token = UUID.randomUUID().toString(true);
        //5.2将user对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //5.3存储到redis中
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+ token, userMap);
        //5.4设置token的过期时间
        stringRedisTemplate.expire(LOGIN_USER_KEY+ token,LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 6.返回token给前端
        return Result.ok(token);


    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
